I might be acting like a devil's advocate, but don't the metrics reflect user behavior? And it's perfectly fine if they tune their UI for revenue. They are no

I might be acting like a devil's advocate, but don't the metrics reflect user behavior? And it's perfectly fine if they tune their UI for revenue. They are not missionaries, but they are visionaries. They need money to keep the innovation going. I am not a facebook fan or an affiliate, and I do resent few of their design decisions, but earning money is well within their framework of morality.